You love the diesel for towing. I learned to change your fuel filter sooner then recommended, I usually do every 10,000. Buy you fuel at places that have good turn over of their diesel. If you taking long trips I recommend the Pilot RV card. It is great pulling into the truck bays to fuel up, easy in and out. I am assuming your truck is new so you will have DEF, diesel exhaust fluid. Make sure you fill that up before trips so you do not have to deal with that during your travels. Besides that it requires normal maintenance like any tv, more frequent oil changes, trans fluid changes, and differential fluid changes. IF you tow diesel the way to go, enjoy!

I would assume that since this is posted in the Berkshire forum, that the OP's new diesel is a Berkshire 390RB-60 instead of a truck.

Jim, I'm not sure where to start since you have so many questions.
I guess I would suggest you browse this Berkshire forum as you will probably find most of your curiosity has already been discussed many times.

Saturday I pick up my first diesel engine vehicle and am heading into unknown waters.

I've done some initial research, talked with some folks.

Now looking to lean on any of you who want to offer things I should keep in mind, be aware of, maintenance, general upkeep, fuel preference/additives, storage, and any other nuggets of wisdom.

How was your transition to diesel and what have you learned along the way?

Always good to see Iowans on the forum. If your gonna run in cold weather, never leave home without diesel service and diesel service 911 fuel additives. Be sure you've got the right oil and antifreeze, they're different for heavy duty diesels than for gassers. The manual is your friend. Assuming this is a motorhome, you've got air brakes to also learn about.

Proper maintenance based on hours or miles is extremely important. We base out maintenance by hours or miles whichever comes first. I would also suggest that you have your maintenance performed at a shop that provides oil sampling and testing. For a few bucks extra, they can send a sample of your oil out to be tested for problems. This can catch problems and possibly save you thousands of dollars in repairs.